Number of n X 3 0..1 arrays with rows and antidiagonals unimodal and columns nondecreasing.

Terms

a(0) =7a(1) =22a(2) =49a(3) =92a(4) =155a(5) =242a(6) =357a(7) =504a(8) =687a(9) =910a(10) =1177a(11) =1492a(12) =1859a(13) =2282a(14) =2765a(15) =3312a(16) =3927a(17) =4614a(18) =5377a(19) =6220a(20) =7147a(21) =8162a(22) =9269a(23) =10472a(24) =11775a(25) =13182a(26) =14697a(27) =16324a(28) =18067a(29) =19930